Debug Error: “Authentication Failed”

In this guide, we will help you solve the Authentication Failed issue when using the WooCommerce FedEx Shipping Plugin. We will also show you how Shopify Ship, Rate and Track for FedEx authenticates the FedEx credentials. Read along to know more.

How to authenticate FedEx credentials when using WooCommerce FedEx Shipping Plugin

With WooCommerce FedEx Shipping plugin installed on your WooCommerce, you can link your FedEx Account and handle shipping. You can display FedEx shipping rates on your Cart/Checkout page, print FedEx shipping labels, enable order tracking, and so much more.

When do you get the Debug Error: “Authentication Failed”?

The plugin works with FedEx APIs and you need a valid FedEx Account to use it. If you don’t have a valid FedEx account, you won’t be able to make use of certain features like label generation. And you will get the error Debug Error: “Authentication Failed” every time you use an invalid account.

A real-life example

To help you understand the severity of this error, we would ask you to go through the conversation below. Here, one of our customers was facing a similar issue and our support team helped him overcome it.


Hello. After activating the WooCommerce Shipping Plugin for FedEx with Print Label, everything seems to work as it should for small orders. In other words, the customer only sees the Flat rate shipping rate.

If I try an order for more than twenty books, instead of a drop-down menu, the customer is presented with a note that says “There are no shipping methods available. Please double check your address, or contact us if you need any help.

With debug turned on, the FedEx response says “Authentication Failed”. I had configured your plugin with the same account number, password, keys, etc., by copying and pasting from the old plugin. But apparently, that did not work for the account authentication. Could you please help me?

PluginHive Support

Errors like the “Authentication Failed” appear only when the FedEx credentials are not correct. This happens at times

  • when you’re using invalid FedEx credentials
  • when you’re using FedEx Test/Development credentials but have checked the “This is a production key”
  • you have the FedEx Production/Live credentials with you but you haven’t checked the “This is a production key”
fedex validate credentials

So we request you to check the credentials in the plugin settings. You can begin here if you don’t have the right credentials with you.

How to authenticate FedEx credentials when using Shopify FedEx App?

With Shopify Ship, Rate and Track for FedEx, store owners can display real-time FedEx shipping rates on the Checkout page. In addition, you can even print shipping labels, enable shipment tracking, schedule FedEx Pickup and so much more.

shopify fedex install

To use such features and begin with FedEx shipping, you would need valid FedEx credentials which you have to enter during the installation process. Have a look at the image below.

shopify fedex installation

The App lets you know whether you have entered the credentials correct or not. Once you have entered the credentials, you can choose to enable the Production Key option. You could also refer to the guide links provided under that option to get the correct FedEx credentials.

Here are some useful links to using Shopify Ship, Rate and Track for FedEx on your Shopify store.


We hope this guide would have helped you solve the Authentication issue when using the WooCommerce Shipping Plugin for FedEx with Print Label. If you have any questions regarding this guide or setting up FedEx shipping on your online store then contact our support team. They should be able to help you out.

Happy selling!